大脑对运动控制的头皮电位研究

目的:研究人脑中无数神经在本体感受性传入信息和运动控制时的生理机制和振荡特征,从全脑的整体观点,论述数个大脑区域的活动和他们的复合电位的综合性神经生理功能。方法:研究在宏范围EEG测量的皮层动态脑理论与大脑刺激性质的振荡反应的基础上,用0 2ms间隔取点时程为100ms高采样率分析头皮脑电位。结果:数字量化头皮脑电位中FP2,F6,C4,F8等脑区的绝对值,相对值和运动觉与运动知觉电位在δ,θ,α,β4个频带比相对应脑区各项值低。频率和功率谱分析发现皮层的主要活动区域4个频带的波峰功率,总功率,最高波幅以及功率95%以下的频率比非主控区高。结论:神经电位从无序到有序状态的转换中,多而强的感觉刺激使大脑成为更好的协调并使脑神经电活动具有空间分布性但时间上同步性的状态。全部振荡频率在整个大脑是选择性分布的,选择性分布的振荡系统控制着全部脑结构的兴奋和交流。     

新疆体育市场发展现状分析及前景展望

分析了新疆体育市场的现状、存在的问题，以及新疆体育市场持续发展的资源优势与潜力，并指出新疆体育市场在新世纪的前景和优先发展的领域。     

对运动员转项成才现象的初步研究

文章对我国现阶段运动训练中存在的运动员转项成才现象进行了剖析,首次提出了异项潜才概念,认为异项潜才的存在是运动员转项成才的重要基础,诸多因素对选材定向的制约、运动员多项成才的可能以及新竞技项目的设立是造成异项潜才存在的原因。异项潜才的主要特征表现为,普及发展程度较低项目的潜才多存在于相似性较高、且普及发展程度也较高的“基础”项目中,并具有这些项目一定的竞技能力特征。异项潜才多具有中级以下训练水平,男子年龄多在20岁以下,女子年龄多在18岁以下。     

单重态卡宾与甲酰氯环加成反应机理的理论研究

用限制的H artree-Fock从头算分子轨道理论研究了单重态卡宾与甲酰氯环加成反应的机理。在HF/3-21G*基组水平上,计算了反应势能面上各驻点的构型参数、振动频率和能量。计算结果表明,该反应的主反应途径由两步组成:首先,两反应物通过一无势垒的放热反应生成一富能中间体INT a,放出的热量为36.47 kJ.m o-l 1;然后该中间体经过渡态TSa异构化为一三元环产物P,其势垒为23.22 kJ.m o-l 1。该反应途径与其竞争反应途径相比具有很好的选择性。     

The dynamics of connecting universities,non-governmental organizations and community members by means of academic projects directed at people in need

In this article we discuss an action research experience that took place from 2002 to 2015. We analyze the inception and progress of several project-based learning-centered academic courses that were aimed at developing the project management skills of graduate and undergraduate students. The experience involved approximately 1800 students from two universities and 40 community partners. The students developed real-life projects on behalf of institutions and non-governmental organizations located in the area that help people in need; we refer to these agencies as ‘community partners.’ We analyze the development of the course from a systemic perspective, making use of causal loop diagrams in order to understand the main driving dynamics. We discuss the results achieved by these projects and the benefits brought to the community partners. We also present testimony from the community partners themselves. We conclude by presenting the lessons we learned over the years we have been running this course.     

Through the Dąbrowski Lens: A Fresh Examination of the Theory of Positive Disintegration

D?browski’s theory of positive disintegration is an emotion-centered, nonontogenetic, five-level theory of personality development where the experience of all emotions is essential for the process of growth. In this article, we examine the complexities of the three factors of development, which are essential to the notion of development within the theory of positive disintegration. We elaborate on the relationships between these factors, depict the processes and interactions in a new graphical framework, provide associated explanations, and support these by additional references to D?browski’s original writings.     

Action learning as an element within an assessed and supported year in employment for newly qualified social workers: a three-role perspective

The assessed and supported year in employment (ASYE) is employer-led and provides a programme to support and assess newly qualified social workers (NQSWs) working with children and families and adults during their first year of employment. Action learning was brought into Cambridgeshire County Councils ASYE programme as a 12-month pilot from October 2015 to September 2016, with the view of providing an opportunity for the 55–60 NQSWs to develop critical thinking, problem-solving and leadership skills. This paper gives an account of the journey from the perspective of the roles of the accoucheur and action learning lead, ASYE Programme Lead and Evaluator and identifies key learning points. In writing this paper, the authors acknowledge the contribution of their colleague facilitators and the NQSWs who participated in action learning sets.     

黄河下游悬河段地下水资源计算及开发潜力分析

黄河水资源是沿黄地区经济和社会发展的重要制约因素.由于黄河在其下游河段(花园口-人海口)河床淤积而形成地上悬河,黄河水侧渗补给已成为该地区地下水的重要补给源.黄河下游悬河段地下水系统面积为29 313km2,赋存着潜水、微承压水(浅层含水层系统)和承压水(深层含水层系统).含水层垂直向上概化为3层:浅层潜水和微承压含水层组、深层承压含水层组及两含水层之间20m～30m厚的弱透水层.计算域边界除梁山一长清一带、徒骇河上游及郑州西南侧为补给边界,其余均为排泄边界.在建立水文地质概念模型的基础上,构建三维地下水流模拟模型,应用FEFLOW有限元软件求解.运用识别和验证后的模型计算了不同保证率年份地下水补给量和可开采资源量.研究区50%和75%降水保证率年份地下水补给资源量分别为62.51×108 m3和54.88×108 m3,可开采资源量为44.82×108 m3和39.20×108m3.将研究区分成18个子区进行地下水开采潜力评价,其中12个区尚有开采潜力,1个区采补基本平衡,5个区开采潜力不足.     

产学合作网络中企业关系势能与自主创新绩效——基于地理边界拓展的调节作用

本文采用中国有机化学行业的产学合作专利数据,进行专利地图分析,并以参与产学合作的企业的自主创新绩效为因变量,构建非平衡面板数据下的负二项回归模型,研究产学合作网络中,企业的关系势能对企业自主创新绩效的影响,并考察合作网络的地理边界拓展对二者关系的调节作用。分析结果发现我国有机化学行业的产学合作近几年增速放缓,且已呈现出地理边界拓展的形态,回归结果支持了部分假设:企业的直接关系规模和间接关系强度与企业自主创新绩效正相关,合作网络的地理边界拓展正向调节间接关系规模、间接关系强度与企业自主创新绩效的关系。     

山东省禹城市粮食生产资源利用效率评价

粮食生产资源利用效率研究是实现粮食稳产、高产的前提，也是保障国家粮食安全的理论基础。对不同条件下的作物生产潜力准确估算和适宜的资源利用效率评价是粮食生产资源利用效率研究的核心内容。本文采用PS123作物生长模型进行作物生产潜力计算，根据山东省禹城市实际状况，确定了模型输入参数，计算了研究区玉米、小麦和大豆的光合、光温、气候和气候－土壤生产潜力，采用作物结构订正计算区域粮食生产潜力。考虑粮食生产中光热资源、水资源、土地资源、社会经济资源等方面，从准则层和因子层两个层面构建了粮食生产资源利用效率评价模型，确定了各评价因子的目标值和权重，对禹城市粮食生产资源利用效率进行评价。研究结果表明：　①山东省禹城市光合生产潜力52 784kg/hm²，光温生产潜力11 023kg/hm²，气候生产潜力8 377kg/hm²，气候-土壤生产潜力6 450kg/hm²，对这3种作物的实际产量进行结构订正得到该市1999年～2001年粮食平均现实生产能力为6 244kg/hm²，禹城市粮食生产潜力较大；　②制约粮食生产稳产、高产主要自然因子为水资源的不合理利用，劳动生产率、化肥利用率和产投比的低下是主要的社会经济限制因子。根据不同的限制性因子，本文提出了单项资源利用技术改进措施。